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Boost Gauge plumbing

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Texas_GST

Probationary Member
18
0
May 2, 2008
Lubbock, Texas
Hello guys. I have searched the links for a while now but I can't seem to find my problem on here. I own a '97 GST. The previous owner had installed a Blitz compressor bypass valve, manual boost controller, and boost gauge. The problem, or at least what I think is a problem is that the gauge and boost controller are plumbed in together. My gauge does not show vaccum, just boost. Here is a pic of the T-fitting that is installed.

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The black vaccum line to the left goes to a line directly behind the intake manifold (passenger side) where it branches off into two lines. The black vaccum line that goes directly down goes to the boost controller, which the output from the boost controller then goes to the wastegate actuator. Is this correct acceptable? I know that the line in the picture below is the one that I should use for this right?

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Last edited:
Everything should be on its own vaccum line. The boost guage should be T-ed into the fuel pressure solenoid. The boost controller should be in a loop from the compressor housing back to the wastegate actuator. Make sure you have the boost controller connected so that when in boost the valve (boost controller) is opening. Otherwise you will have unlimted boost. Then the bypass valve should have one line going directly from the bypass valve nipple to the intake manifold.

I hope this helps!
 
Thanks alot T. Yeah its something I should have looked into long ago and thanks to you, and a premier DSM shop here in Houston, I understand this better. I had someone help me out today to check it all out and I can fix tomorrow. Thanks again.
 
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